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Copyright>        Copyright (C) 1986-2024 Altair Engineering Inc.
Copyright>
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Chd|====================================================================
Chd|  SPMD_REDUCE_DB                source/mpi/generic/spmd_reduce_db.F
Chd|-- called by -----------
Chd|        RADIOSS2                      source/engine/radioss2.F      
Chd|-- calls ---------------
Chd|====================================================================
        SUBROUTINE SPMD_REDUCE_DB(VALUE,RES,MY_SIZE,MY_RANK,MY_OPERATION)
C-----------------------------------------------
C   I m p l i c i t   T y p e s
C-----------------------------------------------
#include      "implicit_f.inc"
C-----------------------------------------------------------------
C   M e s s a g e   P a s s i n g
C-----------------------------------------------
#ifdef MPI
#include "mpif.h"
#endif
C-----------------------------------------------
C   D u m m y   A r g u m e n t s
C-----------------------------------------------
        CHARACTER(len=4), INTENT(in) :: MY_OPERATION
        INTEGER, INTENT(in) :: MY_SIZE,MY_RANK
        REAL(kind=8), DIMENSION(MY_SIZE), INTENT(in) :: VALUE
        REAL(kind=8), DIMENSION(MY_SIZE), INTENT(out) :: RES

#ifdef MPI
C-----------------------------------------------
C   L o c a l  V a r i a b l e s
C-----------------------------------------------
        INTEGER :: error
        INTEGER :: MPI_OPERATION
!       ----------------------------------------
        
        IF(MY_OPERATION(1:3)=="SUM") THEN
                MPI_OPERATION=MPI_SUM
        ELSEIF(MY_OPERATION(1:4)=="PROD") THEN
                MPI_OPERATION=MPI_PROD
        ELSEIF(MY_OPERATION(1:3)=="MAX") THEN
                MPI_OPERATION=MPI_MAX
        ELSEIF(MY_OPERATION(1:3)=="MIN") THEN
                MPI_OPERATION=MPI_MIN               
        ENDIF

!       ------------------
!       mpi comm reduce
        CALL MPI_REDUCE(VALUE,RES,MY_SIZE,MPI_DOUBLE_PRECISION,MPI_OPERATION,MY_RANK,MPI_COMM_WORLD,error)
!       ------------------
#else
        RES = 0
#endif
        RETURN
        END SUBROUTINE SPMD_REDUCE_DB
!       ----------------------------------------

